EPA Asks Car Makers to Road Test Fuel-Economy Claims

Inflated Mileage Claims Trigger New Look at How Measurements Conducted

The Environmental Protection Agency wants auto makers to road test the mileage claims they submit after a rash of recent inflated fuel-economy claims based on wind tunnel and other laboratory measurements.

The proposal, which would require a public comment period, comes after several high profile cases in which estimates provided by Ford Motor Co., Hyundai Motor Co. and Kia Motors Corp. were inflated and triggered complaints to...